Where did the occupancy "out the wazoo" come from?

I keep audible range it lately. The landlord say we have "closets out the wazoo". The gal at the grocery store said they flog "oranges out the wazoo".

Answers: wa·zoo /wɑ'zu/
Pronunciation[wah-zoo] –noun, plural -zoos.
Slang.
1. the anus.
2. the buttocks.
—Idiom
3. up the wazoo, to an extreme degree or within great abundance: She's get problems up the wazoo.
[Perhaps alteration of kazoo.]wazoo is slang for anus.
The phrase means "a lot".

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